diff --git a/im_notif/__init__.py b/im_notif/__init__.py
index 6ff86bc..38fa180 100644
--- a/im_notif/__init__.py
+++ b/im_notif/__init__.py
@@ -1 +1,8 @@
 import im_notif_models
+
+
+def pre_uninstall(cr, registry):
+    query = ("UPDATE res_partner "
+             "SET notify_email = 'always' "
+             "WHERE notify_email LIKE 'im%';")
+    cr.execute(query)
diff --git a/im_notif/__openerp__.py b/im_notif/__openerp__.py
index 33f1606..812ccc3 100644
--- a/im_notif/__openerp__.py
+++ b/im_notif/__openerp__.py
@@ -13,5 +13,6 @@
         'im_notif_data.xml',
         'im_notif_views.xml',
         ],
-    'installable': False
+    'installable': False,
+    'uninstall_hook': 'pre_uninstall',
 }